SuperSpeed USB 3.0 supports transfer rates of up to 5Gbps - The actual transmission speed is limited by the setting of the device connected. 7 USB 3.0 downstream ports for standard desktop PCs. Backwards compatible with USB 2.0 and 1.1 devices. SuperSpeed USB 3.0: accelerated file access and transfer rates. Boost Your Peripheral Capability: USB 3.0 PCI express I/O Card with 7 ports. Connect and Go: Connect any USB 3.0 devices to your PC.